XQuartzが古い

[bob-no-MacBook-Pro:~] bob% brew doctor
Warning: Your XQuartz (2.7.4) is outdated
Please install XQuartz 2.7.5:
https://xquartz.macosforge.org
Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
ruby